Abstract
In this study, influence of fitness of the taper connection of the spindle on the natural frequency on bending vibration of a test bar was studied. The spindle taper must sustain not only a large thrust force but also a large radial force due to the cutting forces, and the large radial force makes front end of the taper expansion gradually in the long term. The expansion of the spindle taper brings the deterioration of cutting ability of the machine tool, therefore the users must regrind the expanded spindle taper when the expansion exceeds a permissible amount. However, this amount is determined empirically in general, because the relation between expansion of the taper and cutting performance has not been clarified yet, and the extent of the relation changes with the change of the static and dynamic behavior of the machine tool. In this study, therefore, the natural frequency of a test bar was used to estimate the spindle taper fitness. Furthermore, end milling chucks having different taper length were also used in cutting tests. As a result, the frequency was strongly influenced by the fitness and the taper having 85% fitness in length by expansion must be reground, because cutting performance of such taper is extremely low compare to that of 100% fitness taper.
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